jose: fix build with old compilers

This commit adds two patches to the jose package that fix the build
with old compilers such as gcc 4.7.

Fixes:

  http://autobuild.buildroot.net/results/00d5a4b809922f8fa42c0de9d461c9754d2f8098

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

1 files changed, 165 insertions, 0 deletions

diff --git a/package/jose/0002-configure-fix-build-with-old-compilers.patch b/package/jose/0002-configure-fix-build-with-old-compilers.patch
new file mode 100644
index 0000000000..0484f38f0d
--- /dev/null
+++ b/package/jose/0002-configure-fix-build-with-old-compilers.patch
@@ -0,0 +1,165 @@
+From 98e9faa4d39cd5b6aaab882877e19ae394ba3810 Mon Sep 17 00:00:00 2001
+From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+Date: Mon, 20 Nov 2017 23:10:38 +0100
+Subject: [PATCH] configure: fix build with old compilers
+
+Old gcc versions (gcc 4.7) do not support all warnings flags currently
+hard-coded by configure.ac. In order to fix this, we import the
+AX_CHECK_COMPILE_FLAG() macro from the autoconf-archive, and use it in
+the configure.ac to only use warning flags when the compiler supports
+them.
+
+Submitted-upstream: https://github.com/latchset/jose/pull/51
+Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+---
+ configure.ac                | 46 +++++++++++++++-------------
+ m4/ax_check_compile_flag.m4 | 74 +++++++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 105 insertions(+), 22 deletions(-)
+ create mode 100644 m4/ax_check_compile_flag.m4
+
+diff --git a/configure.ac b/configure.ac
+index cf8c9a6..6fe4ded 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -1,5 +1,6 @@
+ AC_PREREQ(2.62)
+ AC_INIT(jose, 10)
++AC_CONFIG_MACRO_DIRS([m4])
+ AC_CANONICAL_SYSTEM
+ AC_PROG_CC_C99
+ 
+@@ -18,27 +19,30 @@ PKG_CHECK_MODULES([libcrypto], [libcrypto >= 1.0.2])
+ AC_OPENMP
+ AC_SUBST([OPENMP_CFLAGS])
+ 
+-JOSE_CFLAGS="\
+--Wall \
+--Wextra \
+--Werror \
+--Wstrict-aliasing \
+--Wchar-subscripts \
+--Wformat-security \
+--Wmissing-declarations \
+--Wmissing-prototypes \
+--Wnested-externs \
+--Wpointer-arith \
+--Wshadow \
+--Wsign-compare \
+--Wstrict-prototypes \
+--Wtype-limits \
+--Wunused-function \
+--Wno-missing-field-initializers \
+--Wno-unused-command-line-argument \
+--Wno-unused-parameter \
+--Wno-unknown-pragmas \
+-"
++for flag in \
++    -Wall \
++    -Wextra \
++    -Werror \
++    -Wstrict-aliasing \
++    -Wchar-subscripts \
++    -Wformat-security \
++    -Wmissing-declarations \
++    -Wmissing-prototypes \
++    -Wnested-externs \
++    -Wpointer-arith \
++    -Wshadow \
++    -Wsign-compare \
++    -Wstrict-prototypes \
++    -Wtype-limits \
++    -Wunused-function \
++    -Wno-missing-field-initializers \
++    -Wno-unused-command-line-argument \
++    -Wno-unused-parameter \
++    -Wno-unknown-pragmas ; do
++    AX_CHECK_COMPILE_FLAG([${flag}],
++		[JOSE_CFLAGS="${JOSE_CFLAGS} ${flag}"])
++done
++
+ AC_SUBST([JOSE_CFLAGS])
+ 
+ AC_MSG_CHECKING([for linker script support])
+diff --git a/m4/ax_check_compile_flag.m4 b/m4/ax_check_compile_flag.m4
+new file mode 100644
+index 0000000..dcabb92
+--- /dev/null
++++ b/m4/ax_check_compile_flag.m4
+@@ -0,0 +1,74 @@
++# ===========================================================================
++#  https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
++# ===========================================================================
++#
++# SYNOPSIS
++#
++#   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
++#
++# DESCRIPTION
++#
++#   Check whether the given FLAG works with the current language's compiler
++#   or gives an error.  (Warnings, however, are ignored)
++#
++#   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
++#   success/failure.
++#
++#   If EXTRA-FLAGS is defined, it is added to the current language's default
++#   flags (e.g. CFLAGS) when the check is done.  The check is thus made with
++#   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
++#   force the compiler to issue an error when a bad flag is given.
++#
++#   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
++#
++#   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
++#   macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
++#
++# LICENSE
++#
++#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
++#   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
++#
++#   This program is free software: you can redistribute it and/or modify it
++#   under the terms of the GNU General Public License as published by the
++#   Free Software Foundation, either version 3 of the License, or (at your
++#   option) any later version.
++#
++#   This program is distributed in the hope that it will be useful, but
++#   WITHOUT ANY WARRANTY; without even the implied warranty of
++#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
++#   Public License for more details.
++#
++#   You should have received a copy of the GNU General Public License along
++#   with this program. If not, see <https://www.gnu.org/licenses/>.
++#
++#   As a special exception, the respective Autoconf Macro's copyright owner
++#   gives unlimited permission to copy, distribute and modify the configure
++#   scripts that are the output of Autoconf when processing the Macro. You
++#   need not follow the terms of the GNU General Public License when using
++#   or distributing such scripts, even though portions of the text of the
++#   Macro appear in them. The GNU General Public License (GPL) does govern
++#   all other use of the material that constitutes the Autoconf Macro.
++#
++#   This special exception to the GPL applies to versions of the Autoconf
++#   Macro released by the Autoconf Archive. When you make and distribute a
++#   modified version of the Autoconf Macro, you may extend this special
++#   exception to the GPL to apply to your modified version as well.
++
++#serial 5
++
++AC_DEFUN([AX_CHECK_COMPILE_FLAG],
++[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
++AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
++AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
++  ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
++  _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
++  AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
++    [AS_VAR_SET(CACHEVAR,[yes])],
++    [AS_VAR_SET(CACHEVAR,[no])])
++  _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
++AS_VAR_IF(CACHEVAR,yes,
++  [m4_default([$2], :)],
++  [m4_default([$3], :)])
++AS_VAR_POPDEF([CACHEVAR])dnl
++])dnl AX_CHECK_COMPILE_FLAGS
+-- 
+2.13.6
+